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RF2489
Rev A21 DS070308
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Pin
Function
Description
Interface Schematic
16
GND
Low-inductance ground required.
17
PCS LNA OUT PCS LNA output. Small external inductance required for best impedance
match to 50
Ω.
18
VCC2
PCS LNA VCC connection. A series inductance required for matching.
19
GND
Low-inductance ground required.
20
PCS LNA IN
PCS LNA input. Simple external matching required for best performance.
See pin 17.
21
GND
Low-inductance ground required.
22
CELL LNA IN Cellular LNA input. Simple external matching required for best perfor-
mance.
23
CELL LNA
EMITTER
Cellular LNA emitter. A small inductor connects this pin to ground. Cellular
LNA gain can be adjusted by the inductance.
See pin 22.
24
CELL LNA
OUT
Cellular LNA output. Simple external L-C matching required.
See pin 22.
25
ISET1
Resistor to ground sets both LNA and mixer currents. Lower resistance
results in lower currents for both the LNA and mixer.
26
ISET2
Resistor to ground sets LNA current. Higher resistance results in lower cur-
rent.
27
GND
Low-inductance ground required.
28
CELL MIX IN Cellular mixer RF single-end input. External L-C network required for best
performance.
29
VCC1
VCC for internal references, logic, and mixer preamplifiers. Internal RF
bypass capacitor. External bypass capacitor between 1nF and 47nF
required.
30
BAND SEL
Logic input. High level selects PCS band; low level selects cellular band.
The LO divider circuitry is disabled when BAND SEL is high, regardless of
the state of pin 5 (/2 SELECT). When BAND SEL is low, pin 5 can be
selected high or low. If using a single LO input, pin 5 can be tied to a high
state allowing BAND SEL to control the LO divider function.
31
IP SET
Logic input. High selects external LNA current reference set by the resistor
connected from ISET2 to ground.
32
IF SEL
Logic input. High selects FM IF outputs; low selects CDMA IF outputs.
PCS LNA IN
V
CC
PCS LNA OUT
CELL LNA IN
V
CC
CELL LNA OUT
CELL LNA EMITTER
CELL MIX IN
BAND SEL
IP SET
IF SEL
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